QM - Multiplayer Agent Harness

QM is an open-source multiplayer agent harness for work, built by Y Combinator for startups. Each employee and project gets an isolated workspace with scoped memory, files, keychain, permissions, crons, web apps, and a durable sandbox, while still collaborating with the agent in Slack channels and projects. It is harness-agnostic: Pi, OpenCode, Codex, and Claude Code all drive the same core, so a deployment is not tied to any single vendor. Open-sourced July 2026, already 2,000+ stars on GitHub.